Facebook's Mark Zuckerberg criticized the "fearful voices calling for building walls" during his opening remarks at the company's developer conference Tuesday in San Francisco.

"We've gone from a world of isolated communities to one global community, and we are all better off for it," Zuckerberg said. "But now, as I look around and I travel around the world, I'm starting to see people and nations turning inward — against this idea of a connected world and community."

He added: "I hear fearful voices calling for building walls and distancing people they label as others, for blocking free expression, for slowing immigration, reducing trade and, in some cases around the world, even cutting access to the internet."

And now back to Mark Zuckeberg's house...

Zuckerberg apparently bought four houses surrounding his home last year, for an estimated $30 million. Which gives him a lot of clout when it comes to new people moving into the area.

Theoretically, that's enough space for one spectacular moat.

The Chronicle reports the rash of "no parking" signs in the area have kept many neighbors from parking outside their own homes over the past 17 months.

I'm guessing Zuckerberg somehow got himself elected president of the local homeowner's association. There's also round-the-clock security.

"This is nothing short of a fortress," one homeowner reportedly said. The person supposedly asked that their name not be used, presumably because they're scared of people with more money than Europe.

Those pesky "fearful voices". If only every American could have his own "fortress". And 16 bodyguards.

Mark Zuckerberg has reportedly responded to online threats by hiring 16 bodyguards to protect him at home in California.

The co-founder of Facebook is among a number of young billionaires in Silicon Valley who have increased security after receiving disturbing messages online, a celebrity news website reported.

“He has guards over at his place,” a source told Page Six, adding Mr Zuckerberg's 16-person detail work in shifts at the $10 million home near Palo Alto.

I don't understand all these annoying people who want to build walls instead of "connecting." With my 16 bodyguards and my fortress compound where I intend to survive the destruction of the earth.